Bruce Nunnally Posted May 2, 2012 Report Share Posted May 2, 2012 The Cadillac STS-V intercooler cooling system holds a total of 2.6 quarts of coolant. That’s 0.65 gallons. The benefit of having little coolant is that it heats up quickly, and it cools down quickly. However, I wonder if there is more disadvantage to such a low coolant capacity. The LS9 engine in the ZR1 has a small rectangular intercooler coolant tank inline to hold more coolant. D3 offers a small cylindrical reservoir for the STS-V to hold more coolant and reports good results. I have ordered one of these AVS tanks hoping I can find a good spot to fit it: Read More: http://caddyinfo.com...dpress/?p=12573 Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Texas Jim Posted May 2, 2012 Report Share Posted May 2, 2012 How much more does the new tank hold ?? Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 2, 2012 Author Report Share Posted May 2, 2012 This tank is small, but they claim 1 gallon, so just over x2 what is in there to start. 3.5" so about 1 palm in diameter and 15.5" long. It may fit just over the hx like the D3 tank does. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Texas Jim Posted May 2, 2012 Report Share Posted May 2, 2012 I have a question.. Is the pump a constant speed pump or does it increase speed and volume as the engine speed increases?? Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 2, 2012 Author Report Share Posted May 2, 2012 The intercooler pump is an electric 8gpm centrifugal style pump made by Bosch. Its output in gpm depends on input voltage and system resistance and is not rpm sensitive. There is a lot of debate on the ideal gpm through the system, and as you might expect very little actual experimental data. An Engineer at Laminova, who make the tubes for the intercooler on the STS-V, did tell me that the flow rate through the laminova tubes with oem pump and hx is near ideal. As we add more hx or tanks then people also add different pumps with advertised higher flow rates, but again usually without before/after flow or temp tests. In their tests zzp said they found the oem bosch pump on the cobalts a very good choice for power consumption vs weight vs output. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Texas Jim Posted May 2, 2012 Report Share Posted May 2, 2012 It is going to be difficult to find the optimum flow rate with a bigger tank and bigger hx. Too much flow and the fluid don't stay in the hx long enough to cool down... and too little flow lets it get way too hot before it gets to the hx... Link to comment Share on other sites More sharing options...
BodybyFisher Posted May 2, 2012 Report Share Posted May 2, 2012 You know its funny, today, I relayed your story regarding the coolant flowing too fast through the aftermarket hx and that you were working on flow rates, restricting flow at the output side of the new hx, etc. The odd thing is that I was talking to a pool installer, he was installing a gas pool heater and he said that if the flow through the heat exchanger is too fast heating efficiency will decrease, and I relayed your story to him. There must be a way to estimate required flow required to dissapate heat based on the hx volume and heat dissapation ability no? I did some searching http://www.ehow.com/...exchangers.html Bruce, you being a math wiz you will appreciate this http://www.tipmagazi...2/iss-4/p18.pdf Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 2, 2012 Author Report Share Posted May 2, 2012 Thanks Mike that pdf was interesting. The equations say the faster the flow and the bigger the temp difference between the hot coolant and the air the better. Conventional wisdom from many is what the pool guy says -- slow down the flow to give the water in the HX time to give up the heat. This sort of cognitive dissonance -- one of these things does not match the other -- is why I like to setup and test and see what happens. I believe that the faster the flow the better, but that in a closed system it is crucial to match the flow, the heater, and the cooler. I started with OEM HX and system equilibriam point was about 118F. I changed to the 45321 HX and perhaps increased the system flow rate, and the equilibrium point rose to 128F. This could be because the 45321 is worse at cooling than the OEM HX. It could be because the higher flow rate pulls more heat out of the intercooler into the system, and the 45321 can't remove it all, so the equilibrium point goes up. If I add another HX, I slow down the flow due to added resistance, but also improve the cooler. Hopefully then the system equilibrium point reaches a lower number, like 108F on a 82F ambient day. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 9, 2012 Author Report Share Posted May 9, 2012 Got the AVS tank I ordered in the post today. Very interesting. Previous mention: Cadillac STS-V inline flow-through intercooler tank AVS tank in the box I ordered this as a possible inline tank addition to my Cadillac STS-V intercooler coolant loop. Additional coolant would act as a buffer to temperature changes (both up and down). The stock system has 2.6 quarts. My system has the S3TC heat exchanger added, which holds 2 quarts, so it is running 4.6 quarts. The new tank would add 4 quarts, for 8.6 quarts total. Read More: http://caddyinfo.com/wordpress/?p=12644 Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Texas Jim Posted May 15, 2012 Report Share Posted May 15, 2012 I could be wrong...(wouldn't be the first time)... but I like the idea of added capacity. Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 15, 2012 Author Report Share Posted May 15, 2012 If I am reading my recent test results correctly there may be a simple relation like 3.x sec to circulate each gal of coolant. That makes 2 gal interesting for optimal 0-60 or 4-5 gal for quartermile. I think 2gals a good compromise for daily use; water has weight too. More data with different capacities would confirm or suggest other solutions. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 28, 2012 Author Report Share Posted May 28, 2012 Install notes: http://caddyinfo.com/wordpress/?p=12950 Out to test next. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted May 28, 2012 Author Report Share Posted May 28, 2012 Need to zoom in on the accel run next. Looks like good news so far. Read more: http://caddyinfo.com/wordpress/?p=12950 Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
Bruce Nunnally Posted July 20, 2012 Author Report Share Posted July 20, 2012 Another STS-V owner after reading my story also got an AVS 1 gallon inline tank. He has the D3 Heat Exchanger on his V, so he mounted the AVS tank below the bumper. Looks good & nice install. Bruce 2023 Cadillac CT4-V Blackwing Follow me on: Twitter Instagram Youtube Link to comment Share on other sites More sharing options...
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